US4599960A - Sewing machine thread chain cutter - Google Patents

Sewing machine thread chain cutter Download PDF

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Publication number
US4599960A
US4599960A US06/725,072 US72507285A US4599960A US 4599960 A US4599960 A US 4599960A US 72507285 A US72507285 A US 72507285A US 4599960 A US4599960 A US 4599960A
Authority
US
United States
Prior art keywords
fabric
casing
suction mouth
sewn
shaped portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/725,072
Other languages
English (en)
Inventor
Gianfranco Brusasca
Franco Garzulano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ROCKWELL-RIMOLDI SpA OLCELLA PLANT 33 VIA MONTEBELLO 20020 OLCELLA BUSTO GAROLFO (MILANO) ITALY A CORP OF ITALY
Rockwell-Rimoldi SpA
Original Assignee
Rockwell-Rimoldi SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rockwell-Rimoldi SpA filed Critical Rockwell-Rimoldi SpA
Assigned to ROCKWELL-RIMOLDI, S.P.A., OLCELLA PLANT, 33, VIA MONTEBELLO, 20020 OLCELLA, BUSTO GAROLFO (MILANO), ITALY, A CORP. OF ITALY reassignment ROCKWELL-RIMOLDI, S.P.A., OLCELLA PLANT, 33, VIA MONTEBELLO, 20020 OLCELLA, BUSTO GAROLFO (MILANO), ITALY, A CORP. OF ITALY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BRUSASCA, GIANFRANCO, GARZULANO, FRANCO
Application granted granted Critical
Publication of US4599960A publication Critical patent/US4599960A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D05B65/06—Devices for severing the needle or lower thread and for disposing of the severed thread end ; Catching or wiping devices for the severed thread
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2207/00—Use of special elements
    • D05D2207/02—Pneumatic or hydraulic devices
    • D05D2207/04—Suction or blowing devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S112/00—Sewing
    • Y10S112/01—Suction thread cutting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/2066—By fluid current

Definitions

  • the present invention relates to a thread-cutting device for a sewing machine, for example for a sewing machine which forms a whipstitch on the edges of a fabric.
  • auxiliary devices As is known, sewing machines of the industrial type are provided with various auxiliary devices, the function of which is to make the sewing operations as complete and precise as possible, thereby also reducing the need for manual intervention by the operators controlling the sewing operations.
  • auxiliary devices a particularly important role is played by the thread-cutting devices, the specific function of which is to cut off the thread chain, or loose portion of thread, which is formed on a fabric, at the ends of a seam, when the sewing machine continues to operate in the absence of fabric.
  • These devices suck in the free thread-chains by means of jets of compressed air. These jets can either strike the thread chains directly, so as to turn them back on the fabric and cause them to mesh with the seam, or may be directed, as is usual, so as to create a suction effect which draws the thread chains into a suitable suction mouth in the region of which a cutting element is arranged.
  • the present-day thread-cutting devices perform the operations for which they are intended in an only partially satisfactory manner. In fact, calibrating the size of the suction mouth through which the thread chains are sucked still represents a delicate operation which is often inaccurately performed.
  • This suction mouth must in fact be relatively wide and located in the immediate vicinity of the edge of the fabrics being sewn, so as to ensure that the thread chains are sucked in. In this situation, however, it can easily happen that the fabric being sewn can accidentally enter the suction mouth and suffer extensive damage as a result.
  • the thread chains are also likely to enter into the suction mouth to a greater or lesser extent, depending on the thickness of the thread with which they are made.
  • this thread usually has a cross-section which is proportional to the thickness of the fabric being sewn, it follows that the thread chains present on stiffer fabrics require particularly large suction mouths, to ensure that they are sucked in, whereas the thread chains extending from lighter fabrics are sucked in even by smaller-sized mouths. It is obvious that a thread-cutting device intended for heavy fabrics will suck inside it not only the thread chain of lightweight fabrics, but also the lightweight fabrics themselves. On the other hand, a thread-cutting device designed for lightweight fabrics will prove to be ineffective for heavy fabrics. In view of this situation, the general object of the present invention is to design a thread-cutting device for a sewing machine, which is able to overcome the abovementioned drawbacks of the prior art.
  • an important object of the present invention is to design a device which, while it can be easily adapted and set according to the fabrics being sewn, also has an extremely simple structure and can be easily produced by the industries in the sector.
  • Another important object of the present invention is to design a device which can be easily adjusted, even by unskilled personnel.
  • a thread-cutting device for a sewing machine comprising: a rigid casing fixed on one edge of the working surface in a position adjacent to the fabric being sewn, a discharge tube extending from one end of the said casing to a suction mouth located on the latter and facing the said fabric, a blower apparatus supplied with compressed air and comprising at least one vent located in the said suction mouth and designed to direct the compressed air along the said discharge tube, and a cutting element which is able to swing to and fro and is arranged in the region of in the said mouth, wherein the said metal casing has fixed to it a control element which is provided with a rod-shaped portion passing across the said mouth and can be positioned in a plurality of reference notches located on the outside of the said casing, the said reference notches being arranged in accordance with the types of fabric which can be sewn and being designed to position the said rod-shaped portion in a direction substantially perpendicular to the feed direction of the fabric
  • FIG. 1 is a side view of a sewing machine provided with the thread-cutting device according to the invention, elevated from the working surface of the sewing machine itself;
  • FIG. 2 is a plan view, on an enlarged scale, of part of FIG. 1 in which the needle plate and thread-cutting device are shown;
  • FIG. 3 shows, in isolation, the thread-cutting device, with the closed position of the cutting element being indicated by continuous lines and the open position by dot-dash lines.
  • the thread-cutting device which is the subject of the present invention is indicated by the number 1. It is applied to a sewing machine 2 known per se.
  • the device 1 is applied to one edge of a working surface 3 of the sewing machine 2, behind a needle plate 4.
  • the needle plate 4 has, in a manner known per se, a tongue 5 around which a thread chain 6 is initially formed and which produces a first external part of a seam on a fabric 7 (FIG. 2).
  • the fabric 7 is moved forward in the direction of the thread-cutting device 1 by means of teeth located in the needle plate 4.
  • the thread-cutting device 1 is shown in isolation in FIG. 3 and is externally defined by a rigid, metallic-type casing 8 which has inside it a discharge tube 9 extending from one end 8a of the casing 8 to a suction mouth 10 located in the casing 8 and positioned in parallel relationship with the working surface 3, in a position such that it lies alongside the fabric 7 being sewn, when the latter moves beyond the needle plate 4.
  • suction mouth 10 is formed in plate 8c which completes the vertical wall 8d of casing 8. Plate 8c faces the needle plate 4 in the region of the front end 8b of the casing.
  • plate 8c is disposed in such a way that it is lightly touched by the overedge stitches of the fabric 7.
  • the thread 6 is drawn into the thread chain cutter by virtue of the Venturi effect.
  • the vacuum is created by the compressed air within the discharge tube in the zone immediately behind suction mouth 10.
  • This vacuum is capable of attracting all of the small and light weight bodies that pass close to the suction mouth, as well as thread chain 6, which is attached to the leading and the trailing edges of the fabric.
  • a blower apparatus supplied with compressed air from any known type of air compressor (not shown) communicates with the suction mouth 10 via an appropriate pipe 10d.
  • the said blower apparatus may be structured in various ways, but ends, in any case, in a vent 11 for the compressed air, located at one end of the suction mouth 10, in particular at the end of the latter located furthest away from the end 8a of the casing 8.
  • the vent hole 11 is oriented towards the end 8a of the casing 8 in such a way that it generates a vacuum in the zone lying behind the suction mouth 10.
  • the second vent 12 is directed towards the incoming fabric 7 still located on the needle plate 4.
  • the vent 11 is directed to the opposite direction with respect to the second vent 12; that is said vent 11 supplies an air jet along the discharge tube 9 towards the end 8a of the casing 8.
  • the suction mouth 10 also comprises a cutting element 13, consisting of a blade which is oscillated by means of a crank 14 (FIG. 2) which is in turn actuated by a control shaft 15b mounted within the frame 15 of the machine and operatively connected to the main shaft of the latter.
  • a cutting element 13 consisting of a blade which is oscillated by means of a crank 14 (FIG. 2) which is in turn actuated by a control shaft 15b mounted within the frame 15 of the machine and operatively connected to the main shaft of the latter.
  • the cutting element 13 is designed to operate, swinging angularly upwards, when the fabric 7 is in a rest phase, i.e. between two feed operations performed by the said teeth.
  • the suction mouth 10 comprises a first zone shaped in the manner of a slot 10a extending substantially in a horizontal direction and parallelly to the direction in which fabric 7 being shown is fed.
  • Suction mouth 10 is completed by a second zone shaped as a wide opening 10b which widens out, starting from the lower edge of slot 10a, toward the front end 8b of casing 8 and an upward direction so that it extends higher than the upper edge of the slot forming a cutting edge 10c, which edge cooperates with movable blade 13 for cutting the thread chain 6.
  • the thread chain 6 is cut in the first zone 10a by means of the cutting element 13 and a cutting edge 10c located in the same zone 10a.
  • the cutting element 13 is kept in close contact with the said cutting edge by means of a compression spring 20 wound around a pin 16 which defines the axis of rotation of the cutting element 13 (FIG. 2).
  • a control element 17 is arranged on the outside of the casing 8, which element has a rod-shaped portion 18 which passes across the suction mouth 10 in a direction perpendicular to the direction in which the latter mainly extends.
  • the rod-shaped portion 18 can be positioned across the suction mouth 10 towards or away from the second end 8b of the casing 8.
  • control element 17 consists of a spring wire 19 provided, at the top, with an eyelet 23 substantially parallel to the direction in which the fabric 7 is fed.
  • the eyelet 23 is fixed to the casing 8 by means of a screw-type connecting element 21.
  • the rod-shaped portion 18 is a simple extension of the spring wire 19 and extends from one end of the eyelet 20 in a direction perpendicular to the latter.
  • Reference notches 22, located on the outside of the casing 8, are advantageously provided for positioning of the rod-shaped portion 18.
  • the notches 22 are advantageously grooves which are provided on the casing 8 and are designed to accommodate substantially the rod-shaped portion 18.
  • the notches 22 themselves extend in the region of both the edges of the suction mouth 10 which are parallel to the direction in which the fabric is fed.
  • the notch closest to the end 8a of the casing 8 and delimiting a smaller part of the area 10a of the mouth 10 is the first notch provided for positioning the rod-shaped portion 18 in the case of heavy fabrics such as denim or interlock knitted fabrics.
  • the middle notch or second notch is provided for average-weight fabrics such as knitted fabric up to fineness level 7, or for fabrics made using textured-polyester yarns.
  • the notch closest to the second end 8b of the casing 8, or third notch is provided for lightweight fabrics such as knitted fabric, rib fabric (30 denier) or non-run fabric (90 denier).
  • the thread chain 6 is formed on the projecting part 5 of the needle plate 4 when the fabric is not yet on the projecting part itself.
  • the thread chain 6 is removed from the tongue 5 and remains hanging so that, as the fabric 7 moves towards the thread-cutting device 1, it is sucked inside owing to the suction effect generated by the jet of compressed air emerging from the vent 11 in the direction of the discharge tube 9.
  • vent hole 11 is located on the inner wall of the discharge tube 9, which wall is opposite the suction mouth 10 and said vent hole 11 is oriented so that it directs the stream of compressed air towards the rear end 8a.
  • said vent hole 11 is disposed backwardly, towards the front end 8b so that between the vent hole itself and the suction mouth 10 a thread chain suction chamber is created within the discharge tube 9.
  • the compressed air that can be produced by any known generator (not shown) is sent into the pipe 10d and allowed to come out of the vent hole 11 within the discharge tube 9.
  • the stream of compressed air coming out of the vent hole 11 expands quickly as far as it takes up the whole discharge tube 9 starting from a point thereof which is situated downstream of the suction mouth 10, in the direction of the rear end 8a of said discharge tube 9.
  • the working zone for insertion of the thread chain 6 that is delimited, on one side, by the rod-shaped portion 18 and, on the opposite side, by the end of the suction mouth 10 closest to said front end 8b of the casing 8.
  • the yarn forming the thread chain 6 will also be very light and therefore the space delimited by the third notch 22 will be perfectly adequate for insertion of the thread chain itself.
  • the advanced position of the rod-shaped portion 18 prevents the lightweight fabric being sucked accidentally into the suction mouth.
  • the rod-shaped portion 18 is arranged in the first notch and, therefore, the working zone of the suction mouth is increased so as to ensure insertion of a thread chain normally consisting of yarn which has a larger cross-section and is hence stiffer. The widening of the suction mouth does not lead to the fabric being accidentally sucked in during sewing, on account of the stiffness of the said fabric.
  • the rod-shaped portion 18 can be easily and accurately positioned owing solely to the presence of the notches 22, together with the appropriate instructions. Moreover, the notches 22 allow the rod-shaped portion 18 to be inserted flush with the casing 8. The rod-shaped portion 18 is thus prevented from hindering or blocking the fabric which is being fed forward in the vicinity of the suction mouth 10.
  • the invention thus achieves the proposed objects.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Gas Separation By Absorption (AREA)
US06/725,072 1984-11-09 1985-04-19 Sewing machine thread chain cutter Expired - Fee Related US4599960A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT23740/84[U] 1984-11-09
IT8423740U IT8423740V0 (it) 1984-11-09 1984-11-09 Dispositivo taglia catenella per macchina da cucire.

Publications (1)

Publication Number Publication Date
US4599960A true US4599960A (en) 1986-07-15

Family

ID=11209583

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/725,072 Expired - Fee Related US4599960A (en) 1984-11-09 1985-04-19 Sewing machine thread chain cutter

Country Status (8)

Country Link
US (1) US4599960A (hu)
JP (1) JPS61234892A (hu)
CH (1) CH663975A5 (hu)
DE (1) DE3522860C2 (hu)
FR (1) FR2573098B1 (hu)
GB (1) GB2166761B (hu)
IT (1) IT8423740V0 (hu)
NL (1) NL8503264A (hu)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4672902A (en) * 1986-07-21 1987-06-16 Clinton Industries, Inc. Pneumatically operated thread cutter
US5203270A (en) * 1990-12-20 1993-04-20 Atlanta Attachment Company Sewing machine with latch back device
US5613454A (en) * 1994-12-29 1997-03-25 Union Special Corporation Vacuum latchtack throat plate with a vacuum generating apparatus
US6273013B1 (en) 2000-03-14 2001-08-14 L&P Property Management Company Thread tail control apparatus and method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5052318A (en) * 1990-06-22 1991-10-01 Union Special Corporation Adjustable stitch chain cutting assembly inlet

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3143987A (en) * 1961-10-26 1964-08-11 Union Special Maschinenfab Thread chain severing device for sewing machines
US3749040A (en) * 1970-05-02 1973-07-31 Union Special Maschinenfab Thread-chain cutting device for sewing machines with means for adjusting length of thread remaining on work
GB2059463A (en) * 1979-09-29 1981-04-23 Totalstore Ltd Thread cutting device
US4328758A (en) * 1979-09-17 1982-05-11 Clevepak Corporation Thread end holder for sewing machine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1710917B1 (de) * 1963-02-15 1970-04-30 Carl Schmale Fa Fadenketten-Abschneideinrichtung fuer Naehmaschinen
IT1010261B (it) * 1974-04-30 1977-01-10 Virginio Rimoldi E C Spa Dispositivo tagliacatenella per macchine per cucire
IT1085309B (it) * 1977-02-02 1985-05-28 Rockwell Rimoldi Spa Dispositivo per orientare e trattenere la catenella di punti all'inizio di una cucitura
DE2835994C2 (de) * 1977-09-22 1983-12-08 Rockwell-Rimoldi S.p.A., Olcella, Milano Überwendlichnähmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3143987A (en) * 1961-10-26 1964-08-11 Union Special Maschinenfab Thread chain severing device for sewing machines
US3749040A (en) * 1970-05-02 1973-07-31 Union Special Maschinenfab Thread-chain cutting device for sewing machines with means for adjusting length of thread remaining on work
US4328758A (en) * 1979-09-17 1982-05-11 Clevepak Corporation Thread end holder for sewing machine
GB2059463A (en) * 1979-09-29 1981-04-23 Totalstore Ltd Thread cutting device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4672902A (en) * 1986-07-21 1987-06-16 Clinton Industries, Inc. Pneumatically operated thread cutter
US5203270A (en) * 1990-12-20 1993-04-20 Atlanta Attachment Company Sewing machine with latch back device
US5613454A (en) * 1994-12-29 1997-03-25 Union Special Corporation Vacuum latchtack throat plate with a vacuum generating apparatus
US6273013B1 (en) 2000-03-14 2001-08-14 L&P Property Management Company Thread tail control apparatus and method

Also Published As

Publication number Publication date
IT8423740V0 (it) 1984-11-09
GB8515191D0 (en) 1985-07-17
JPS61234892A (ja) 1986-10-20
GB2166761A (en) 1986-05-14
JPS624152B2 (hu) 1987-01-28
GB2166761B (en) 1988-06-02
DE3522860A1 (de) 1986-05-22
FR2573098B1 (fr) 1988-10-14
FR2573098A1 (fr) 1986-05-16
NL8503264A (nl) 1986-06-16
CH663975A5 (it) 1988-01-29
DE3522860C2 (de) 1987-03-26

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AS Assignment

Owner name: ROCKWELL-RIMOLDI, S.P.A., OLCELLA PLANT, 33, VIA M

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:BRUSASCA, GIANFRANCO;GARZULANO, FRANCO;REEL/FRAME:004465/0250

Effective date: 19850916

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Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

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Year of fee payment: 4

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LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 19940720

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362